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# Title: Opticks: Or, A Treatise Of The Reflexions, Refractions, Inflexions and Colours Of Light (shelfmark Leibn. Marg. 193)
# Folio 70, page id 1677894601:0246
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P
7
other Bodies as much rarer as he pleales, Pothat Lieht
may find a seuds pallase chroush transparene lub.
Ctances.
PROP. 1Z.
Bodies reflect and refract Fisht hy one and the same
porver variousty exercised in various circumstances.
This appears by lererat Considerations. First, BC.
cause irtien Lisht soes out oF Citals into AIr, a5 ob.
liquetr a5 it can postibly do, il its incidence be made
AiIl more oblique, it becomes totally reflected. For
theporver of the Cilals atter it has retracted the Lighe
as obliquely a5 is possible if the incidence be sill made
more oblique, becomes to0 Arons to let any oF its rayS
50 chroush, and by consequence causes total rellexions.
Sccondly, Becaule Light is alternately reflected and
transmitted by chin Plates oF Cilass for many successions
accordinslr, a5 the thichnels of the Plate increases
in an arithmetical Progression. Forhere the thicknels
ol the Clals determines irhether that porrer by which
Class acts upon Lisht Mall cause it to be reRected, Or
Cusser it tobe transmitted. And, Thirdly, because those
Turtaces of transparent Bodies artich hare the sreates
retractins pover, relect the sreatest quantiey ot Lislitus
aS Was Cered in the hrst Proposition.
P R OP. Z.
L Laest de Pase io s bian in Vacud i lisC
propertion of the Sines rehich measure the refraction of the
Bodies, the forces of the Bodies to reflect and refract Lisht,
ar